RM36D0EC _51 Engine / Hybrid System _083048 HYBRID / BATTERY CONTROL _0709511 HYBRID CONTROL SYSTEM C

HYBRID / BATTERY CONTROL HYBRID CONTROL SYSTEM P1C8449 High Voltage Power Resource Circuit Short during Ready ON

DTC SUMMARY

MALFUNCTION DESCRIPTION

The hybrid vehicle control ECU assembly monitors the high-voltage wiring between the HV battery and inverter with converter assembly and detects an open circuit malfunction.

HINT:: ·

This DTC is differentiated from P300449 based on detection timing (after power switch is turned on (READY)). If P300449 is also output at the same time, first perform troubleshooting for P300449.

·

If there is a SMRG stuck open malfunction, only P1C8449 is output.

The cause of this malfunction may be one of the following:

Inverter voltage sensor (VH or VL) internal circuit malfunction

Voltage sensor (VH or VL) malfunction

Motor generator control ECU (MG ECU) malfunction

Communication (wire harness) malfunction

High voltage system malfunction

HV battery malfunction

HV battery junction block assembly malfunction

Inverter with converter assembly malfunction

High-voltage wire harness malfunction

High-voltage connector or connection malfunction

Low-voltage circuit (12 V) malfunction

Hybrid vehicle control ECU assembly malfunction

HV battery junction block assembly malfunction

Low voltage wire harness malfunction

Low voltage connector malfunction

DESCRIPTION

Refer to the description for DTC P0AE411.

Click hereEngine / Hybrid System>HYBRID / BATTERY CONTROL>HYBRID CONTROL SYSTEM>P0AE411202409,999999,_51,_083048,_0709511,RM100000002NGZO_06,P0AE411

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL	Warning Indicate	Note
P1C8449	High Voltage Power Resource Circuit Short during Ready ON	High-voltage circuit malfunctions between the HV battery and inverter with converter assembly. The voltage before boosting continues to be out of the HV battery voltage range or the integrated value of variation amount of the voltage before boosting for a specified period of time is large while the power switch is on (READY). The EV electric battery fuse in the service plug grip is blown, the service plug grip is removed, SMRB or SMRG remains open, or the high-voltage cable has an open circuit. (1 trip detection logic)	· HV battery junction block assembly · Wire harness or connector · Hybrid vehicle control ECU assembly	Comes on	Master Warning: Comes on	SAE Code: P3004

Related Data List
DTC No.	Data List
P1C8449	· Hybrid/EV Battery Voltage · Hybrid/EV Battery Current · VL-Voltage before Boosting · VH-Voltage after Boosting

The following items can be helpful when performing repairs:

Data List

Ready Signal

CONFIRMATION DRIVING PATTERN

HINT:: ·

After repair has been completed, clear the DTC and then check that the vehicle has returned to normal by performing the following All Readiness check procedure.

Click hereEngine / Hybrid System>HYBRID / BATTERY CONTROL>HYBRID CONTROL SYSTEM>UTILITY202409,999999,_51,_083048,_0709511,RM100000002NGYK,

·

When clearing the permanent DTCs, refer to the "CLEAR PERMANENT DTC" procedure.

Click hereEngine / Hybrid System>HYBRID / BATTERY CONTROL>HYBRID CONTROL SYSTEM>DTC CHECK / CLEAR202409,999999,_51,_083048,_0709511,RM100000002NGYO,

Connect the GTS to the DLC3.

Turn the power switch on (IG) and turn the GTS on.

Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).

Turn the power switch off and wait for 2 minutes or more.

Turn the power switch on (IG) and turn the GTS on.

Turn the power switch on (READY) and wait for 3 minutes or more. [*1]

HINT:: ·

According to the display on the GTS, read the Data List and monitor the values of "Hybrid/EV Battery Voltage" and "VL-Voltage before Boosting" for 3 minutes. If the difference between "Hybrid/EV Battery Voltage" and "VL-Voltage before Boosting" is always less than 50 V, the vehicle has returned to normal.

·

[*1]: Normal judgment procedure.

The normal judgment procedure is used to complete DTC judgment and also used when clearing permanent DTCs.

Enter the following menus: Powertrain / Hybrid Control / Utility / All Readiness.

Check the DTC judgment result.

HINT:: ·

If the judgment result shows NORMAL, the system is normal.

·

If the judgment result shows ABNORMAL, the system has a malfunction.

·

If the judgment result shows INCOMPLETE, perform the normal judgment procedure again.

WIRING DIAGRAM

Refer to the wiring diagram for the HV battery high-voltage line circuit.

Click hereEngine / Hybrid System>HYBRID / BATTERY CONTROL>HYBRID CONTROL SYSTEM>HV Battery High-voltage Line Circuit202409,999999,_51,_083048,_0709511,RM100000002NH18_04,

CAUTION / NOTICE / HINT

CAUTION:: Refer to the precautions before inspecting high voltage circuit.; Click hereEngine / Hybrid System>HYBRID / BATTERY CONTROL>HYBRID CONTROL SYSTEM>PRECAUTION202409,999999,_51,_083048,_0709511,RM100000002NGYF,

PROCEDURE

1.CHECK DTC OUTPUT (HYBRID CONTROL, MOTOR GENERATOR, HV BATTERY)

Connect the GTS to the DLC3.

Turn the power switch on (IG).

Enter the following menus: Powertrain / Hybrid Control, Motor Generator and HV Battery / Trouble Codes.

Check for DTCs.

Powertrain > Hybrid Control > Trouble Codes: 50001 397

Powertrain > Motor Generator > Trouble Codes: 50001 395

Powertrain > HV Battery > Trouble Codes: 50001 398

Result:

Result	Proceed to
P1C8449 only is output, or P0A9563 and DTCs except the ones in the table below are also output.	A
DTCs of hybrid control system in the tables below are output.	B
DTCs of motor generator control system in the tables below are output.	C
DTCs of hybrid battery system in the tables below are output.	D
P0A9563 is also output.	E

Malfunction Content	System	Relevant DTC
Microcomputer malfunction	Hybrid control system	P0A1B49	Drive Motor "A" Control Module Internal Electronic Failure
	Hybrid control system	P060647	Hybrid/EV Powertrain Control Module Processor Watchdog / Safety MCU Failure
	Motor generator control system	P0A1B1F	Generator Control Module Circuit Intermittent
		P0A1A47	Generator Control Module Watchdog / Safety μC Failure
		P0A1A49	Generator Control Module Internal Electronic Failure
		P1C2A1C	Generator A/D Converter Circuit Circuit Voltage Out of Range
		P1C2A49	Generator A/D Converter Circuit Internal Electronic Failure
		P313383	Communication Error from Generator to Drive Motor "A" Value of Signal Protection Calculation Incorrect
		P313386	Communication Error from Generator to Drive Motor "A" Signal Invalid
	Hybrid battery system	P060687	Hybrid/EV Battery Energy Control Module Processor to Monitoring Processor Missing Message
		P060A47	Hybrid/EV Battery Energy Control Module Monitoring Processor Watchdog / Safety MCU Failure
		P060A87	Hybrid/EV Battery Energy Control Module Processor from Monitoring Processor Missing Message
		P060B16	Hybrid/EV Battery Energy Control Module A/D Processing Circuit Voltage Below Threshold
		P060B49	Hybrid/EV Battery Energy Control Module A/D Processing Internal Electronic Failure
Power source circuit malfunction	Motor generator control system	P06D61C	Generator Control Module Offset Power Circuit Voltage Out of Range
	Hybrid battery system	P1CBB12	Hybrid/EV Battery Current Sensor Power Supply Circuit Short to Auxiliary Battery
	Hybrid battery system	P1CBB14	Hybrid/EV Battery Current Sensor Power Supply Circuit Short to Ground or Open
Communication system malfunction	Hybrid control system	P312387	Lost Communication with Drive Motor Control Module "A" from Hybrid/EV Control Module Missing Message
	Hybrid control system	U011187	Lost Communication with Hybrid/EV Battery Energy Control Module "A" Missing Message
	Motor generator control system	P313387	Communication Error from Generator to Drive Motor "A" Missing Message
Sensor and actuator circuit malfunction	Hybrid control system	P0ABF00	Hybrid/EV Battery Current Sensor "A" Circuit Range/Performance
		P0AD911	Hybrid/EV Battery Positive Contactor Circuit Short to Ground
		P0AD915	Hybrid/EV Battery Positive Contactor Circuit Short to Auxiliary Battery or Open
		P0ADD11	Hybrid/EV Battery Negative Contactor Circuit Short to Ground
		P0ADD15	Hybrid/EV Battery Negative Contactor Circuit Short to Auxiliary Battery or Open
	Motor generator control system	P0D2D16	Drive Motor "A" Inverter Voltage Sensor(VH) Circuit Voltage Below Threshold
	Motor generator control system	P0D2D17	Drive Motor "A" Inverter Voltage Sensor(VH) Circuit Voltage Above Threshold
	Hybrid battery system	P0ABF11	Hybrid/EV Battery Current Sensor "A" Circuit Short to Ground
		P0ABF15	Hybrid/EV Battery Current Sensor "A" Circuit Short to Auxiliary Battery or Open
		P0ABF28	Hybrid/EV Battery Current Sensor "A" Signal Bias Level Out of Range / Zero Adjustment Failure
		P0ABF2A	Hybrid/EV Battery Current Sensor "A" Signal Stuck In Range
		P0B0E11	Hybrid/EV Battery Current Sensor "B" Circuit Short to Ground
		P0B0E15	Hybrid/EV Battery Current Sensor "B" Circuit Short to Auxiliary Battery or Open
		P0B1362	Hybrid/EV Battery Current Sensor "A"/"B" Signal Compare Failure
System malfunction	Hybrid control system	P0A1F94	Hybrid/EV Battery Energy Control Module Unexpected Operation
		P0D2D1C	Drive Motor "A" Inverter Voltage Sensor Voltage Out of Range
		P0E311C	Boosting Converter Voltage Sensor "A" Voltage Out of Range
		P1C8349	High Voltage Power Resource Circuit Voltage Sensor after Boosting Malfunction
		P300449	High Voltage Power Resource Circuit Short during Pre-Charge
	Motor generator control system	P1CB69E	Drive Motor "A" Inverter Voltage Sensor(VH) Stuck On
	Motor generator control system	P0CA300	DC/DC Converter Step Up Voltage Performance

HINT:: ·

P1C8449 may be output as a result of the malfunction indicated by the DTCs above.

(a)

The chart above is listed in inspection order of priority.

(b)

Check DTCs that are output at the same time by following the listed order. (The main cause of the malfunction can be determined without performing unnecessary inspections.)

Turn the power switch off.

2.CLEAR DTC

GO TO DTC CHART (HYBRID CONTROL SYSTEM)

Click hereEngine / Hybrid System>HYBRID / BATTERY CONTROL>HYBRID CONTROL SYSTEM>DIAGNOSTIC TROUBLE CODE CHART202409,999999,_51,_083048,_0709511,RM100000002NGYS,

GO TO DTC CHART (MOTOR GENERATOR CONTROL SYSTEM)

for 2WD:

Click hereEngine / Hybrid System>HYBRID / BATTERY CONTROL>MOTOR GENERATOR CONTROL SYSTEM (for 2WD with LITHIUM-ION BATTERY [Production date from 2021/08])>DIAGNOSTIC TROUBLE CODE CHART202409,999999,_51,_083048,_0481415,RM100000002NG33,

for AWD:

Click hereEngine / Hybrid System>HYBRID / BATTERY CONTROL>MOTOR GENERATOR CONTROL SYSTEM (for AWD with LITHIUM-ION BATTERY)>DIAGNOSTIC TROUBLE CODE CHART202409,999999,_51,_083048,_0587253,RM100000002NG5E,

GO TO DTC CHART (HYBRID BATTERY SYSTEM)

Click hereEngine / Hybrid System>HYBRID / BATTERY CONTROL>HYBRID BATTERY SYSTEM (for LITHIUM-ION BATTERY [Production date from 2021/08])>DIAGNOSTIC TROUBLE CODE CHART202409,999999,_51,_083048,_0481414,RM100000002NGA1,

GO TO DTC CHART (P0A9563)

Click hereEngine / Hybrid System>HYBRID / BATTERY CONTROL>HYBRID BATTERY SYSTEM (for LITHIUM-ION BATTERY [Production date from 2021/08])>P0A9563202104,999999,_51,_083048,_0481414,RM100000001XCNO,P0A9563

2.CLEAR DTC

Click hereEngine / Hybrid System>HYBRID / BATTERY CONTROL>HYBRID CONTROL SYSTEM>P06881F202409,999999,_51,_083048,_0709511,RM100000002NGZ0_06_0017,P06881F

Result:

Proceed to
NEXT

3.CHECK DTC OUTPUT (HYBRID CONTROL)

Connect the GTS to the DLC3.

With the vehicle stopped, apply the parking brake and turn the power switch on (READY).

NOTICE:: Perform this test with the AUTO function (shift-linked function) of the electric parking brake system off.

HINT:: ·

If the power switch could not be turned on (READY), turn the power switch off and check for DTCs after turning the power switch on (READY) again.

·

Because P300449 uses 2 trip detection logic, the DTC detection conditions need to be met 2 times.

·

When the parking brake indicator (red) is illuminated after the electric parking brake switch assembly has been pulled to the lock side, the maximum amount of braking force is applied if the electric parking brake switch assembly is pulled to the lock side one more time.

Ensure the safety of the areas in front and at the back of the vehicle.

Move the shift lever to D and depress both the accelerator pedal and brake pedal at the same time.

HINT:: Depressing both the accelerator pedal and brake pedal at the same time causes the HV battery current to flow and ensures that there is no problem with the high-voltage wiring.

Enter the following menus: Powertrain / Hybrid Control / Trouble Codes.

Check for DTCs.

Powertrain > Hybrid Control > Trouble Codes: 50001 397

Result:

Result	Proceed to
P1C8449 is output, or no DTCs are output.	A
Power switch could not be turned on (READY) and DTC P300449 is output.	B

Turn the power switch off.

4.CHECK CONNECTOR CONNECTION CONDITION (HYBRID VEHICLE CONTROL ECU ASSEMBLY CONNECTOR)

GO TO DTC CHART (P300449)

Click hereEngine / Hybrid System>HYBRID / BATTERY CONTROL>HYBRID CONTROL SYSTEM>P300449202409,999999,_51,_083048,_0709511,RM100000002NH0D,P300449

4.CHECK CONNECTOR CONNECTION CONDITION (HYBRID VEHICLE CONTROL ECU ASSEMBLY CONNECTOR)

Click hereEngine / Hybrid System>HYBRID / BATTERY CONTROL>HYBRID CONTROL SYSTEM>P056014202409,999999,_51,_083048,_0709511,RM100000002NGYV_11_0001,P056014

Result:

Proceed to
OK
NG

5.CHECK CONNECTOR CONNECTION CONDITION (FLOOR WIRE CONNECTOR)

CONNECT SECURELY

5.CHECK CONNECTOR CONNECTION CONDITION (FLOOR WIRE CONNECTOR)

Click hereEngine / Hybrid System>HYBRID / BATTERY CONTROL>HYBRID CONTROL SYSTEM>P0AA000202409,999999,_51,_083048,_0709511,RM100000002NGZD_15_0010,P0AA000

Result:

Result	Proceed to
OK	A
NG (The connector is not connected securely.)	B
NG (The terminals are not making secure contact or are deformed, or water or foreign matter exists in the connector.)	C

6.CHECK CONNECTOR CONNECTION CONDITION (HV BATTERY JUNCTION BLOCK ASSEMBLY CONNECTOR)

CONNECT SECURELY

REPAIR OR REPLACE HARNESS OR CONNECTOR

6.CHECK CONNECTOR CONNECTION CONDITION (HV BATTERY JUNCTION BLOCK ASSEMBLY CONNECTOR)

Click hereEngine / Hybrid System>HYBRID / BATTERY CONTROL>HYBRID CONTROL SYSTEM>P0AA000202409,999999,_51,_083048,_0709511,RM100000002NGZD_15_0019,P0AA000

Result:

Proceed to
OK
NG

7.CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU ASSEMBLY - HV BATTERY JUNCTION BLOCK ASSEMBLY)

CONNECT SECURELY

7.CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU ASSEMBLY - HV BATTERY JUNCTION BLOCK ASSEMBLY)

CAUTION:: Be sure to wear insulated gloves.

Check that the service plug grip is not installed.

NOTICE:: After removing the service plug grip, do not turn the power switch on (READY), unless instructed by the repair manual because this may cause a malfunction.

Remove the No. 1 HV battery cover panel RH.

Click hereEngine / Hybrid System>HYBRID / BATTERY CONTROL>HV BATTERY (for LITHIUM-ION BATTERY [Production date from 2021/08])>REMOVAL202409,999999,_51,_083048,_0481191,RM100000002NEA3_01_0361,

Disconnect the M32 HV battery junction block assembly connector.

Disconnect the A30 hybrid vehicle control ECU assembly connector.

2.604,3.333 3.073,3.604 0.469,0.271 1.406,0.167 1.875,0.438 0.469,0.271 1.292,3.406 0.865,4.073 true 0.865,1.25 1.094,2.083 true 2.021,3.406 2.385,4.063 true 0.677,1.521 0.51,1.927 true 0.281,0.281 0.594,0.438 0.313,0.156 10 false *a 0.333,2.563 0.646,2.719 0.313,0.156 10 false *b 1.531,0.219 1.865,0.396 0.333,0.177 10 false A30 2.677,3.375 3.01,3.552 0.333,0.177 10 false M32 0.906,2.125 1.521,2.323 0.615,0.198 10 false SMRB 0.635,4.083 1.25,4.281 0.615,0.198 10 false SMRB 0.333,1.969 0.948,2.167 0.615,0.198 10 false SMRG 2.26,4.094 2.875,4.292 0.615,0.198 10 false SMRG

*a	Front view of wire harness connector (to Hybrid Vehicle Control ECU Assembly)
*b	Front view of wire harness connector (to HV Battery Junction Block Assembly)

Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection	Condition	Specified Condition
A30-2 (SMRB) - M32-1 (SMRB)	Power switch off	Below 1 Ω
A30-27 (SMRG) - M32-4 (SMRG)	Power switch off	Below 1 Ω

Reconnect the A30 hybrid vehicle control ECU assembly connector.

Reconnect the M32 HV battery junction block assembly connector.

Install the No. 1 HV battery cover panel RH.

Result:

Proceed to
OK
NG

8.CHECK HARNESS AND CONNECTOR (HV BATTERY JUNCTION BLOCK ASSEMBLY - BODY GROUND)

REPAIR OR REPLACE HARNESS OR CONNECTOR

8.CHECK HARNESS AND CONNECTOR (HV BATTERY JUNCTION BLOCK ASSEMBLY - BODY GROUND)

CAUTION:: Be sure to wear insulated gloves.

Check that the service plug grip is not installed.

NOTICE:: After removing the service plug grip, do not turn the power switch on (READY), unless instructed by the repair manual because this may cause a malfunction.

Remove the No. 1 HV battery cover panel RH.

Click hereEngine / Hybrid System>HYBRID / BATTERY CONTROL>HV BATTERY (for LITHIUM-ION BATTERY [Production date from 2021/08])>REMOVAL202409,999999,_51,_083048,_0481191,RM100000002NEA3_01_0361,

Disconnect the M32 HV battery junction block assembly connector.

2.656,1.083 3.01,1.344 0.354,0.26 1.833,1.219 2.292,1.823 true 0.083,0.063 0.396,0.219 0.313,0.156 10 false *a 2.323,1.844 2.635,2 0.313,0.156 10 false GND 2.719,1.125 3.031,1.281 0.313,0.156 10 false M32

*a	Front view of wire harness connector (to HV Battery Junction Block Assembly)

Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection	Condition	Specified Condition
M32-3 (GND) - Body ground	Power switch off	Below 1 Ω

Reconnect the M32 HV battery junction block assembly connector.

Install the No. 1 HV battery cover panel RH.

Result:

Proceed to
OK
NG

9.REPLACE HV BATTERY JUNCTION BLOCK ASSEMBLY

REPAIR OR REPLACE HARNESS OR CONNECTOR

9.REPLACE HV BATTERY JUNCTION BLOCK ASSEMBLY

Click hereEngine / Hybrid System>HYBRID / BATTERY CONTROL>HV RELAY ASSEMBLY (for LITHIUM-ION BATTERY [Production date from 2021/08])>REMOVAL202409,999999,_51,_083048,_0481192,RM100000002NEA8,

Result:

Proceed to
NEXT

10.CHECK HYBRID VEHICLE CONTROL ECU ASSEMBLY (CHECK FOR NORMAL OPERATION)

CAUTION:: Be sure to wear insulated gloves.

Install the service plug grip.

Turn the power switch on (IG).

Clear the DTCs.

Click hereEngine / Hybrid System>HYBRID / BATTERY CONTROL>HYBRID CONTROL SYSTEM>DTC CHECK / CLEAR202409,999999,_51,_083048,_0709511,RM100000002NGYO,

Turn the power switch off and wait for 2 minutes or more.

Turn the power switch on (READY).

Enter the following menus: Powertrain / Hybrid Control / Data List / Hybrid/EV Battery Voltage, VL-Voltage before Boosting.

According to the display on the GTS, read the Data List and monitor the values of "Hybrid/EV Battery Voltage" and "VL-Voltage before Boosting" for 3 minutes.

Powertrain > Hybrid Control > Data List

Tester Display
VL-Voltage before Boosting
Hybrid/EV Battery Voltage

50003 397 150,227

Result:

Result	Proceed to
Difference between "Hybrid/EV Battery Voltage" and "VL-Voltage before Boosting" is always less than 50 V.	A
Difference between "Hybrid/EV Battery Voltage" and "VL-Voltage before Boosting" is 50 V or more.	B

Turn the power switch off.

END

REPLACE HYBRID VEHICLE CONTROL ECU ASSEMBLY

Click hereEngine / Hybrid System>HYBRID / BATTERY CONTROL>HYBRID VEHICLE CONTROL ECU>REMOVAL202409,999999,_51,_083048,_0400692,RM100000002NNM9,